污泥生物炭活化过硫酸盐降解磺胺嘧啶的研究

doi:10.19741/j.issn.1673-4831.2021.0806

摘要/Abstract

摘要： 以污水处理厂二沉池污泥为原材料热解制备生物炭，通过扫描电镜、比表面积及孔径分析仪、X射线衍射仪及X射线光电子能谱仪等对生物炭物化性质进行表征。构建污泥生物炭/过硫酸盐体系并将其用于磺胺嘧啶的降解去除，探究投加量、温度和pH值等反应条件对磺胺嘧啶去除的影响，分析了该体系中磺胺嘧啶的去除机制。结果表明，热解使得污泥孔隙结构和表面组成发生一定变化；高温(700℃)热解制备的污泥生物炭具有更好的过硫酸盐活化效能；升高温度有利于磺胺嘧啶的降解去除；在pH值(3.8~8.8)、氯离子浓度(0~10 mmol·L^-1)和硫酸根离子浓度(0~10 mmol·L^-1)范围内，体系对磺胺嘧啶都能保持较高的去除效率；高浓度(10 mmol·L^-1)碳酸根、碳酸氢根和磷酸氢根离子对体系产生一定的抑制作用；高浓度(10~100 mg·L^-1)腐殖酸会明显抑制磺胺嘧啶的降解，但实际水环境对体系的影响不大；活性氧物种猝灭试验和电子顺磁共振(EPR)检测证明在该体系降解磺胺嘧啶过程中自由基发挥了主要作用。

关键词: 污泥, 生物炭, 过硫酸盐, 磺胺嘧啶

Abstract: Biochar was prepared by pyrolysis using sludge from secondary sedimentation tank of sewage treatment plant as raw material. The physicochemical properties of biochar were characterized by scanning electron microscope, specific surface area and pore size analyzer, X-ray diffractometer and X-ray photoelectron spectroscopy. A sludge biochar/persulfate system was constructed and used for the degradation of sulfadiazine. The effects of the dosage, temperature, pH value and other reaction conditions on the removal of sulfadiazine were explored, and the removal mechanism of sulfadiazine in the system was analyzed. The results show that the pyrolysis process caused certain changes in the pore structure and surface composition of the sludge. The sludge biochar prepared at high temperature (700℃) performed better persulfate activation efficiency and the increase of temperature favored the degradation of sulfadiazine. In the range of pH value (3.8-8.8), chloride ion concentration (0-10 mmol·L^-1) and sulfate ion concentration (0-10 mmol·L^-1), the system could maintain high removal efficiency of sulfadiazine. High concentrations (10 mmol·L^-1) of carbonate, bicarbonate and hydrogen phosphate ions had certain inhibition function on the system. High concentration (10-100 mg·L^-1) of humic acid could obviously inhibit the degradation of sulfadiazine, but the actual water environment showed little effect on the system. The active species quenching test and electron paramagnetic resonance (EPR) detection proves that free radicals could play a major role in the degradation of sulfadiazine in the system.

Key words: sludge, biochar, persulfate, sulfadiazine

中图分类号:

X703.1
X52

聂鹂尧, 胡凯, 汪昊睿, 史宸菲, 王国祥. 污泥生物炭活化过硫酸盐降解磺胺嘧啶的研究[J]. 生态与农村环境学报, 2022, 38(9): 1165-1173.

NIE Li-yao, HU Kai, WANG Hao-rui, SHI Chen-fei, WANG Guo-xiang. Degradation of Sulfadiazine Using Persulfate Activated by Sludge Biochar[J]. Journal of Ecology and Rural Environment, 2022, 38(9): 1165-1173.

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